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ALOPECIA - BLACK HAIR LOSS (FOLLICULAR DYSPLASIA)

Note for Pet Owners:

This information is provided by Provet for educational purposes only.

You should seek the advice of your veterinarian if your pet is ill as only he or she can correctly advise on the diagnosis and recommend the treatment that is most appropriate for your pet.

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Description
Affected dogs are born with a normal hair coat, but their coat changes within 2-4 weeks and black hairs are lost. 


Cause
I
t is an inherited defect which involves abnormal pigmentation of the hair  during the period of hair formation, which weakens the shaft of the hairs. It has been suggested that melanocyte-stimulating hormone may be deficient in these patients.


Breed Occurrence
This disease affects young dogs with two or three coat colours (bicolours or tricolours). It has been reported to occur in mongrels and the following breeds : American Cocker Spaniels, Basset Hounds, Beagles, Bearded Collies, Dachshunds, Gordon Setters, Papillons, Pointers, Salukis and the Schipperke.


Signs
The black hairs lose their natural sheen within the first few weeks of birth, and only black hairs are gradually lost until none are left by 6-9 months of age. Excessive scale is produced in affected areas.


Complications
Excessive scale


Diagnosis
On histopathological examination the hair shafts are broken and there is accumulated melanin within the hair shafts, and in epidermal cells, follicle cells and hair matrix cells.


Treatment
There is no satisfactory treatment for this condition. As it is caused by hair shaft fracture avoid over-shampooing or vigorous brushing.


Prognosis
This disease produces an unusual appearance, but it is not serious and affected dogs can expect to live a normal life.


Long term problems

Updated January 2016

 
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